Researchers in Taiwan have developed a system that contains a 2 × 2 Fresnel lens array and a photo voltaic panel made from III-V supplies and polycrystalline photo voltaic cells, with low gentle leakage.
A Taiwanese analysis group claims to have found the reason for pure gentle leakage in high-concentration photovoltaic (HCPV) methods that use a Fresnel lens as a focusing lens.
Scientists say that HCPV methods mixed with Fresnel lenses are capable of soak up daylight even in cloudy climate situations and that, nevertheless, these units endure from gentle leakages. .
“Fresnel lenses are designed to scale back the burden of the lens so it may meet the necessities of a sun-tracking system,” they stated. “Nonetheless, in contrast to typical lenses, non-smooth and discontinuous lens surfaces distributed over many areas can inevitably trigger vital gentle leakage as a consequence of manufacturing errors such because the radii of curvature and draft angles of manufactured Fresnel lenses.”
The researchers imagine that using a Fresnel lens with a width of 129 mm and a thickness of 1.81 mm. They thought of a focusing space with a measurement of 1.1 mm × 1.1 mm, a spotlight energy ratio of 63%, and a lightweight leakage ratio outdoors the focusing space of 37%. Additionally they measured the sunshine power within the gentle leakage space of Fresnel lenses with completely different buildings underneath monochromatic gentle irradiation and used diffuse plates with completely different penetration charges to simulate out of doors situations in several one other thickness of the cloud layer.
Based mostly on the outcomes of this simulation, the workforce was capable of design a HCPV system that may reportedly present good efficiency even underneath cloudy skies. It features a 2 × 2 Fresnel lens array in a field with two rotation dimensions that may be manually adjusted to face the solar immediately at any time. The PV unit depends on a high-efficiency photo voltaic panel based mostly on III-V supplies on the focus level and polycrystalline photo voltaic cells positioned round it.
“The sunshine leakage from the Fresnel lens construction and the scattered gentle from the daylight passing by means of the clouds will be directed to the polycrystalline silicon-based photo voltaic panel for energy technology,” the teachers stated. “When the sky is obvious, the sunshine is concentrated within the high-efficiency photo voltaic cell, so the ability technology effectivity is excessive. In a heavy cloud, the daylight can’t be concentrated within the high-efficiency photo voltaic cell, subsequently a traditional HCPV can not generate electrical energy effectively, however this design can nonetheless generate electrical energy by means of polycrystalline photo voltaic panels.
By way of the simulation, the Taiwanese group confirmed that the Fresnel lens can attain the sunshine of about 20,000 to 40,000 lx within the gentle leakage area, whether or not it’s sunny or cloudy day with completely different cloud thickness.
The analysis workforce offered the HCPV system within the examine “Hybrid high-concentration photovoltaic system designed for various climate situations,” which was lately revealed in Scientific experiences.
The workforce contains scientists from the Nationwide Central College of Taiwan and the Nationwide Yang Ming Chiao Tung College.
“The proposed novel solar energy system is beneficial for reaching optimum solar energy technology underneath completely different cloudy skies,” they concluded.
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